| Message ID | 1289494639.17691.1499.camel@edumazet-laptop |
|---|---|
| State | Accepted, archived |
| Delegated to: | David Miller |
| Headers | show |
From: Eric Dumazet <eric.dumazet@gmail.com> Date: Thu, 11 Nov 2010 17:57:19 +0100 > It is important to move nud_state outside of the often modified cache > line (because of refcnt), to reduce false sharing in neigh_event_send() > > This is a followup of commit 0ed8ddf4045f (neigh: Protect neigh->ha[] > with a seqlock) > > This gives a 7% speedup on routing test with IP route cache disabled. > > Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> > --- > David, it appears I forgot to push this patch, I have it in my tree > since one month. Thanks ! Applied, thanks. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/include/net/neighbour.h b/include/net/neighbour.h index 55590ab..815b2ce 100644 --- a/include/net/neighbour.h +++ b/include/net/neighbour.h @@ -96,16 +96,16 @@ struct neighbour { struct neigh_parms *parms; unsigned long confirmed; unsigned long updated; - __u8 flags; - __u8 nud_state; - __u8 type; - __u8 dead; + rwlock_t lock; atomic_t refcnt; struct sk_buff_head arp_queue; struct timer_list timer; unsigned long used; atomic_t probes; - rwlock_t lock; + __u8 flags; + __u8 nud_state; + __u8 type; + __u8 dead; seqlock_t ha_lock; unsigned char ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))]; struct hh_cache *hh;
It is important to move nud_state outside of the often modified cache line (because of refcnt), to reduce false sharing in neigh_event_send() This is a followup of commit 0ed8ddf4045f (neigh: Protect neigh->ha[] with a seqlock) This gives a 7% speedup on routing test with IP route cache disabled. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> --- David, it appears I forgot to push this patch, I have it in my tree since one month. Thanks ! include/net/neighbour.h | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html